I changed permission in /var/www
and I wrote "|/usr/bin/procmail -f-" in /root/ispconfig/isp/cont/forward.master
Now i can recive ok mails with this line in /root/ispconfig/isp/cont/forward.master, but my antispam continues without working
It doesnt mark any mail as spam and in my tab of anti-vir and filter anti-spam that option its checked.

I too seem to be having this issue. Running Perfect Ubuntu setup and just upgraded from .24 to .27 hoping to fix the issue... No luck.

I started off being able to send but not receive email, then through a number of trial and errors figured out DNS was an issue (now resolved). Now I send emails to the server and they are no longer getting bounced back as an undeliverable mailbox.... but I also never actually get the emails..